Quartz is graphic framework used on Mac OS X. It forms a graphic layer. Term Quartz is used to represent Quartz 2D and Quartz Compositor. Quartz graphic is a 2D renderer in Core Graphics.
Questions tagged [quartz-graphics]
1214 questions
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UIBezierPaths Not Showing in CALayer drawLayer inContext
I am using the code below to draw an arc into the drawLayer method of a custom CALayer class but nothing is displayed:
(void) drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
float r = self.bounds.size.width/2;
…
Karthun
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IPHONE: memory still allocated after releasing object?
I have a method for drawing an object offscreen to a file, using quartz. The last lines of this method are:
CGRect LayerRect = CGRectMake(mX,mY, wLayer, hLayer);
CGContextDrawImage(objectContext, LayerRect, objectProxy.image.CGImage); // 1
CGRect…
Duck
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CALayer filters and bounds
I'm just starting writing some Core Animation code and I've just spent a frustrating day trying to figure out a particular problem.
I have two layer-backed views that together make up a wizard/ assistant style user interface:
1) a custom background…
Frank
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How to use Quartz to do the spotlight effect?
I would like to do some effect like this using Quartz:
I would like to have a layer on top of the imageView, but some of the area is no covered, how can I implement it? Any ideas? Thanks.
DNB5brims
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Fill the interior of path keeping line width visible
I am trying to fill the interior of shape but no use. It only strokes path but do not fill with hello colour. I have googled but nothing works as fill not working. Guide me what I am doing wrong.
CGContextRef ctx =…
fibnochi
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how to draw circle with only its stroke
I just want to draw circle with stroke, the code below draws well but it fills the circle.
I do not want it filled. Please help me
self.circleView = [[UIView alloc] initWithFrame:CGRectMake(10,20,20,20)];
circleView.alpha = 0.5;
…
erdemgc
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CGContext giving unexpected line width
I'm trying to draw a L shape, the code works but the lines are not of the right width and is 5 pixels thick for vertical lines and some are 3 pixels thick despite me explicitly telling it to use 3 pixel as line width,what am I doing wrong? here's my…
fibnochi
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ios drawing on uiscrollview with pan and pinch
This is a self-answering question in gratitude to the various help I've gained off both StackOverflow and the Ray Wenderlich tutorial on drawing. I thought I'd put the various snippets together in one package.
My problem was that I wanted to do…
Neil MCCABE
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Vector Graphics draw a knobs
I would like to draw an interface with knob, similar to "overdrive" (green) in this photo:
In iOS, such as vector graphics should I use? Quartz, OpenGL ES, or something else?
I'm sure can be done with OpenGL, but I think it's very complicated. So…
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How to draw a pdf context in another context?
I created a PDF context and the context is saved in the file.
As the existing pdf context to draw in a different context?
pdfContext -> viewContext
my code:
void myCreatePDFFile(CGRect pageRect, const char *fileName){
CGContextRef…
TESTer
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3 answers
UIGraphicsBeginImageContext is not drawing
I want to draw lines frequently in my view, but it is not working. I dont want to use drawRect, as I have to maintain the state of the previous drawn lines also. Below is the code for line drawing. Please guide.
- (void)drawPathWithPoints:(int)xAxis…
york
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Core Graphics AddQuadCureToPoint from Center of View/Circle
What I am trying to accomplish is drawing curved lines from a center of a view. So far with the help of much googling and this site...I've accomplished the image below.
http://www.flickr.com/photos/57562417@N00/9100635690/
What I would like to do is…
JL272
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2 answers
Why am I getting the error "QuarzCore/QuartzCore.h not found"?
I am new to iOS development and trying to build an app for the device. It gives me the error "QuartzCore.h not found". However, when I try to build the same for the Simulator, it works fine.
I tried adding the QuartzCore.Framework in the build…
rahul
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Freehand drawing in iOS - Need to use points
I'm trying to implement freehand drawing on top of an image, but I don't want to save the result as an image. I've adapted code from this article, but I am not seeing anything draw (though I know the drawRect method is being called). I've verified…
thephatp
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Issue drawing custom UINavigationBar back button
I am using Quartz 2D to draw a back arrow (like a less than sign - <) as the back button of the UINavigationController. This is working fine for the normal button, but it is not changing the image when the button is selected…
David Pettigrew
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